CN112502228A - Hydraulic engineering desilting device - Google Patents

Hydraulic engineering desilting device Download PDF

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Publication number
CN112502228A
CN112502228A CN202011457244.4A CN202011457244A CN112502228A CN 112502228 A CN112502228 A CN 112502228A CN 202011457244 A CN202011457244 A CN 202011457244A CN 112502228 A CN112502228 A CN 112502228A
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CN
China
Prior art keywords
frame
silt
sludge
dredging
plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN202011457244.4A
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Chinese (zh)
Inventor
魏艳
王淑风
陈晨
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN202011457244.4A priority Critical patent/CN112502228A/en
Publication of CN112502228A publication Critical patent/CN112502228A/en
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/28—Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways
    • E02F5/282—Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways with rotating cutting or digging tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/03—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements self-supporting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/94—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging the filter cake, e.g. chutes
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/8816—Mobile land installations
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
    • E02F3/905—Manipulating or supporting suction pipes or ladders; Mechanical supports or floaters therefor; pipe joints for suction pipes
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
    • E02F3/92—Digging elements, e.g. suction heads
    • E02F3/9256—Active suction heads; Suction heads with cutting elements, i.e. the cutting elements are mounted within the housing of the suction head
    • E02F3/9268—Active suction heads; Suction heads with cutting elements, i.e. the cutting elements are mounted within the housing of the suction head with rotating cutting elements
    • E02F3/9281—Active suction heads; Suction heads with cutting elements, i.e. the cutting elements are mounted within the housing of the suction head with rotating cutting elements with axis of rotation in horizontal and transverse direction of the suction pipe

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The invention discloses a dredging device for hydraulic engineering, which comprises a dredging box, a telescopic mechanism and a sludge suction frame, wherein the dredging box, the telescopic mechanism and the sludge suction frame are arranged on a base, the dredging box is connected with the sludge suction frame through a water pump, the telescopic mechanism is connected with the sludge suction frame through a cylinder, the inner wall of the sludge suction frame is provided with a motor, a power shaft of the motor is a rotating rod, the rotating rod extends into the sludge suction frame to be connected with a stirring blade, a sludge suction port is formed in the sludge suction frame, and a circular net partition is arranged on the sludge suction port. The rotating rod is driven to rotate by the motor, and the sludge in a space framed by the sludge suction frame is scattered by the stirring blades, so that the sludge can be fully and quickly extracted by the device; the telescopic mechanism drives the silt suction frame to adjust the position, so that silt at different positions in the river channel can be conveniently extracted; the sludge is separated by the inclined filter plate and the filter frame, and the filtered water is discharged back to the river channel through the water outlet hose.

Description

Hydraulic engineering desilting device
Technical Field
The invention relates to the technical field of hydraulic engineering, in particular to a dredging device for hydraulic engineering.
Background
The projects built for eliminating water damage and developing and utilizing water resources are divided into flood control projects, farmland hydraulic projects, hydroelectric power generation projects, waterway and harbor projects, water supply and drainage projects, environmental hydraulic projects, coastal reclamation projects and the like according to different functions, and the projects can serve multiple targets such as flood control, water supply, irrigation, power generation and the like, are called comprehensive utilization hydraulic projects, and the hydraulic projects need to build different types of hydraulic buildings such as dams, dikes, spillways, sluice gates, water inlets, channels, ferrys, rafts, fishways and the like so as to realize the targets.
Often need clear up the silt in the river course among the hydraulic engineering, present desilting device is direct inserts the aquatic with the desilting pipe, adsorbs silt and water in the river course, and not only work efficiency is lower like this, hardly carries out abundant clearance with the silt in the river course moreover, and the result of use is relatively poor.
Disclosure of Invention
The invention aims to provide a dredging device for a hydraulic engineering, which aims to solve the problem of low working efficiency in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a hydraulic engineering sediment removal device, is including setting up desilting case, telescopic machanism on the base and inhaling the silt frame, the desilting case passes through the water pump with inhaling the silt frame and is connected, telescopic machanism passes through the cylinder with inhaling the silt frame and is connected, the inner wall of inhaling the silt frame is provided with the motor, the power shaft of motor is the bull stick, the bull stick stretches into inhales the silt frame and is connected with stirring vane, it inhales the silt mouth to be equipped with in the silt frame, it separates to be provided with circular net on the silt mouth to inhale.
Preferably, the lower end of the base is fixed with a roller.
Preferably, telescopic machanism includes the riser, the right side upper end at the base is fixed to the riser, the right side of riser is equipped with electric telescopic handle, electric telescopic handle's the other end is equipped with the connecting plate, telescopic machanism's top is equipped with the horizontal pole, the one end of horizontal pole is fixed on the connecting plate, the other end of horizontal pole passes the riser and passes through horizontal pole and desilting roof portion sliding connection, the lower extreme of connecting plate is equipped with the diaphragm, the lower extreme of diaphragm is equipped with the spliced pole, the lower extreme of spliced pole is equipped with the connecting block, the lower extreme of connecting block is.
Preferably, an inclined filter plate is arranged in the dredging box, the inner wall of the inclined filter plate is connected with a filter frame in a sliding mode, an external thread cover is connected to the dredging box in a threaded mode, and a water outlet hose is arranged at the bottom of the dredging box.
Preferably, the upper end of desilting case is equipped with the conveyer pipe, the conveyer pipe passes the riser through the opening and is connected with the end of intaking of water pump, the upper end fixed mounting of water pump is at the lower extreme of diaphragm, the play water end fixedly connected with diversion hose of water pump, diversion hose's the other end and inhale the silt mouth and be connected.
Compared with the prior art, the invention has the beneficial effects that:
1. the motor drives the rotating rod to rotate, and the stirring blades are utilized to break up sludge in a space framed by the sludge suction frame, so that the sludge can be fully and quickly extracted.
2. The telescopic mechanism drives the silt suction frame to adjust the position, so that silt at different positions in the river channel can be conveniently extracted.
3. The invention separates the sludge by the inclined filter plate and the collection filter frame, and discharges the filtered water back to the river channel through the water outlet hose.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a schematic enlarged side view of the vertical plate of the present invention;
FIG. 3 is an enlarged partial cross-sectional view of the dredging tank of the present invention;
fig. 4 is a partially enlarged view of the circular screen according to the present invention.
Fig. 5 is a schematic view illustrating the connection between the locking block and the locking groove of the present invention.
In the figure: 1-a base; 11-a roller; 2-a telescoping mechanism; 21-standing a plate; 22-an electric telescopic rod; 23-a connecting plate; 24-a cross-bar; 25-a connecting rod; 26-a transverse plate; 27-connecting column; 28-connecting blocks; 29-cylinder; 3-sludge suction frame; 31-a motor; 32-a rotating rod; 33-stirring blades; 4-dredging the silt box; 41-inclined filter plates; 42-collected in the filter frame; 43-an externally threaded cap; 44-water outlet hose; 45-conveying pipe; 46-a through port; 47-a water pump; 48-water hose; 49-sludge suction port; 5-circular net spacing.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Examples
Referring to fig. 1-4, a hydraulic engineering dredging device comprises a dredging box 4, a telescoping mechanism 2 and a silt suction frame 3 which are arranged on a base 1, wherein the dredging box 4 is fixedly welded on the left upper end of the base 1, the dredging box 4 is connected with the silt suction frame 3 through a water pump 47, the telescoping mechanism 2 is connected with the silt suction frame 3 through a cylinder 29, the inner wall of the silt suction frame 3 is provided with a motor 31, the motor 31 is fixedly arranged on the left inner wall of the silt suction frame 3, the power shaft of the motor 31 is a rotating rod 32, the motor 31 can drive the rotating rod 32 to rotate, the rotating rod 32 is provided with a waterproof rubber pad which rotates on the inner wall of the silt suction frame 3 to prevent water from contacting the motor, the rotating rod 32 extends into the silt suction frame 3, the rotating rod 32 is provided with a stirring blade 33, the stirring blade 33 is uniformly fixed on the rotating rod 32, a silt suction port 49 is arranged in the silt suction frame 3, the silt suction port 49 is arranged on the right side of the, the sludge suction port 49 is provided with a circular net partition 5, and the circular net partition 5 is in threaded connection with the end part of the sludge suction port 49, so that the blockage or damage of massive particles entering the water diversion hose 48 can be effectively prevented.
Referring to fig. 1, a roller 11 is fixed at the lower end of a base 1, and the roller 11 is fixedly installed at the lower end of the base 1, so that the device is convenient to move.
Referring to fig. 1 and 2, the telescopic mechanism 2 includes a vertical plate 21, the vertical plate 21 is fixed at the upper end of the right side of the base 1, the vertical plate 21 is fixedly welded at the upper end of the right side of the base 1, an electric telescopic rod 22 is arranged at the right side of the vertical plate 21, a connecting plate 23 is arranged at the other end of the electric telescopic rod 22, the electric telescopic rod 22 can drive the connecting plate 23 to move left and right, a cross rod 24 is arranged above the telescopic mechanism 2, one end of the cross rod 24 is connected with the connecting plate 23, and the other end of the cross rod 24 penetrates through the vertical plate 21. As shown in fig. 5, the top of the dredging box 4 is provided with a slide rail, the slide rail is of a clamping groove type, the lower end of the cross rod 25 is provided with a clamping block, the clamping block is clamped with the clamping groove, under the action of the cylinder 22, the cross rod 24 moves left and right in the through hole 241, the cross rod 25 moves synchronously in the clamping groove through the clamping block, and in order to reduce the friction force between the clamping block and the clamping groove, the contact part of the clamping block and the clamping groove is a cambered surface. The lower extreme of connecting plate 23 is equipped with diaphragm 26, and diaphragm 26 fixed welding is at the lower extreme of connecting plate 23, and the lower extreme of diaphragm 26 is equipped with water pump 47 and spliced pole 27, and the setting of spliced pole 27 can reduce the position of desilting case 4, alleviates the elongation of cylinder 29, and the lower extreme of spliced pole 27 is equipped with connecting block 28, and the lower extreme of connecting block 28 is equipped with cylinder 29, and cylinder 29 fixed mounting is at the lower extreme of connecting block 28.
Referring to fig. 1 and 3, an inclined filter plate 41 is disposed in the dredging box 4, the inclined filter plate 41 is fixedly welded on the inner wall of the dredging box 4 and is disposed below the conveying pipe 45, the inner wall of the inclined filter plate 41 is slidably connected with a filter frame 42, the filter frame 42 is clamped on the inner wall of the inclined filter plate 41, an external thread cover 43 is screwed on the dredging box 4, the external thread cover 43 is screwed into the dredging box 4, so as to open the left side of the dredging box 4, facilitate taking out the filter frame 42 and cleaning the inclined filter plate 41, a water outlet hose 44 is disposed at the bottom of the dredging box 4, and the water in the dredging box 4 is conveniently introduced into the river channel through the water outlet hose 44.
Referring to fig. 1 and 2, a delivery pipe 45 is disposed at the upper end of the dredging box 4, the delivery pipe 45 passes through the vertical plate 21 through a through opening 46 and is connected with a water inlet end of a water pump 47, the delivery pipe 45 passes through the vertical plate 21 through the through opening 46, the upper end of the water pump 47 is fixedly mounted at the lower end of the horizontal plate 26, a water guiding hose 48 is fixedly connected to a water outlet end of the water pump 47, the water guiding hose 48 is fixed at a water outlet end of the water pump 47, and the other end of the.
The invention is implemented as follows: the device is moved to the edge of the river channel, the electric telescopic rod 22 is opened, the electric telescopic rod 22 drives the connecting plate 23 to move towards the right side, the connecting plate 23 drives the cross rod 24 to slide in the vertical plate 21, meanwhile, the conveying pipe 45 penetrates through the through hole 46 of the vertical plate 21, the stability of movement of the transverse plate 26 is ensured, the air cylinder 29 is opened, the air cylinder 29 drives the silt suction frame 3 to descend into the river channel until the silt suction frame 3 reaches the bottom of the river channel, the motor 31 is opened, the motor 31 drives the rotating rod 32 to rotate, the stirring blades 33 on the rotating rod 32 can stir silt and water in the silt suction frame 3, the silt covered by the silt suction frame 3 can be sufficiently stirred, at the moment, the water pump 47 is opened, the mixture of the silt and the water enters the water diversion hose 48 through the silt suction port 49, and the circular net partition 5 can effectively prevent large particles from entering the water diversion hose 48 and damaging the water diversion hose 48, the mixture of the sludge and the water enters the dredging box 4 through the delivery pipe 45, and is filtered by the inclined filter plate 41 and the filter frame 42, so that the water passes through the inclined filter plate 41, the sludge is remained on the inclined filter plate 41 and slowly flows into the filter frame 42, and the water passing through the inclined filter plate 41 can flow back to the river channel through the water outlet hose 44; when the sludge in the dredging box 4 needs to be cleaned, the external screw thread cover 43 can be unscrewed, the filter frame 42 is pulled upwards from the inclined filter plate 41, the filter frame 42 is taken out from the dredging box 4 for cleaning, after cleaning, the dredging box 4 is put back to the dredging box 4 and clamped on the inclined filter plate 41, and the external screw thread cover 43 is screwed on the dredging box 4 to close the dredging box 4.
It should be noted that the specific model specifications of the electric telescopic rod 22, the air cylinder 29, the motor 31 and the water pump 47 need to be determined by type selection according to the actual specification of the device, and the specific type selection calculation method adopts the prior art in the field, so detailed description is omitted.
The power supply and the principle of the electric telescopic rod 22, the air cylinder 29, the motor 31 and the water pump 47 are clear to those skilled in the art and will not be described in detail herein.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. The utility model provides a hydraulic engineering desilting device which characterized in that: including base (1) and setting desilting case (4), telescopic machanism (2) on base (1) and inhale silt frame (3), desilting case (4) with inhale silt frame (3) and be connected through water pump (47), telescopic machanism (2) with inhale silt frame (3) and be connected through cylinder (29), the inner wall of inhaling silt frame (3) is provided with motor (31), the power shaft of motor (31) is bull stick (32), bull stick (32) stretch into and inhale silt frame (3) and be equipped with stirring vane (33), it inhales silt mouth (49) to be equipped with in silt frame (3), it separates (5) to inhale silt mouth (49) department and is provided with circular net.
2. The hydraulic engineering desilting device of claim 1, characterized in that: the lower end of the base (1) is fixed with a roller (11).
3. The hydraulic engineering desilting device of claim 1, characterized in that: the telescopic mechanism (2) comprises a vertical plate (21), the vertical plate (21) is fixed on the base (1), one side of the vertical plate (21) is provided with an electric telescopic rod (22), the end part of the electric telescopic rod (22) is provided with a connecting plate (23), a cross bar (24) is arranged above the telescopic mechanism (2), the cross bar (24) is horizontally arranged on the vertical plate (21), one end of the cross bar (24) is fixedly connected with the connecting plate (23), the other end of the cross bar (24) penetrates through the vertical plate (21) and is connected with the top of the dredging box (4) in a sliding way through a connecting rod (25), a transverse plate (26) is arranged at the lower end of the connecting plate (23), a connecting column (27) is arranged at the lower end of the transverse plate (26), the lower extreme of spliced pole (27) is equipped with connecting block (28), the lower extreme of connecting block (28) is equipped with cylinder (29).
4. The hydraulic engineering desilting device of claim 1, characterized in that: the dredging box is characterized in that an inclined filter plate (41) is arranged in the dredging box (4), a filter frame (42) is arranged on the inclined filter plate (41), an external thread cover (43) is connected to the dredging box (4) in a threaded manner, and a water outlet hose (44) is arranged at the bottom of the dredging box (4).
5. A hydraulic engineering dredging device according to claim 3, wherein: the upper end of desilting case (4) is equipped with conveyer pipe (45), conveyer pipe (45) are passed riser (21) through opening (46) and are connected with the end of intaking of water pump (47), water pump (47) fixed mounting is at the lower extreme of diaphragm (26), the play water end fixedly connected with diversion hose (48) of water pump (47), the other end and the silt sucking mouth (49) of diversion hose (48) are connected.
CN202011457244.4A 2020-12-10 2020-12-10 Hydraulic engineering desilting device Withdrawn CN112502228A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011457244.4A CN112502228A (en) 2020-12-10 2020-12-10 Hydraulic engineering desilting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011457244.4A CN112502228A (en) 2020-12-10 2020-12-10 Hydraulic engineering desilting device

Publications (1)

Publication Number Publication Date
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114197382A (en) * 2021-12-28 2022-03-18 山东安澜工程建设有限公司 Waterproof drainage device based on hydraulic engineering

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1449843A (en) * 1972-10-03 1976-09-15 Stork Conrad Bv Suction dredger
US7334358B1 (en) * 2005-11-14 2008-02-26 Colin D Whyte Portable dredging equipment
CN108842847A (en) * 2018-08-09 2018-11-20 黎星满 The quick desilting equipment of water conservancy construction
CN109083215A (en) * 2018-08-17 2018-12-25 安徽喜洋洋农业科技有限公司 A kind of Accrete clearing device for Agricultural Water rice field
CN209703590U (en) * 2019-01-14 2019-11-29 李健 A kind of Accrete clearing device for water head site environmental protection
CN210369116U (en) * 2019-08-06 2020-04-21 江西省昭昀建设工程有限公司 Sediment removal device is used in hydraulic engineering construction
CN210482419U (en) * 2019-07-20 2020-05-08 高丙锋 Hydraulic engineering desilting device
CN211080353U (en) * 2019-08-20 2020-07-24 孙杰 Quick desilting device of hydraulic engineering with stirring function
CN211922770U (en) * 2019-10-14 2020-11-13 楚宸建设集团有限公司 Hydraulic engineering desilting device
CN212001335U (en) * 2020-01-31 2020-11-24 安徽骏雄建筑工程有限公司 Mud removing device for hydraulic engineering
CN212026400U (en) * 2020-02-09 2020-11-27 徐州云创物业服务有限公司 River course cleaning device for hydraulic engineering

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1449843A (en) * 1972-10-03 1976-09-15 Stork Conrad Bv Suction dredger
US7334358B1 (en) * 2005-11-14 2008-02-26 Colin D Whyte Portable dredging equipment
CN108842847A (en) * 2018-08-09 2018-11-20 黎星满 The quick desilting equipment of water conservancy construction
CN109083215A (en) * 2018-08-17 2018-12-25 安徽喜洋洋农业科技有限公司 A kind of Accrete clearing device for Agricultural Water rice field
CN209703590U (en) * 2019-01-14 2019-11-29 李健 A kind of Accrete clearing device for water head site environmental protection
CN210482419U (en) * 2019-07-20 2020-05-08 高丙锋 Hydraulic engineering desilting device
CN210369116U (en) * 2019-08-06 2020-04-21 江西省昭昀建设工程有限公司 Sediment removal device is used in hydraulic engineering construction
CN211080353U (en) * 2019-08-20 2020-07-24 孙杰 Quick desilting device of hydraulic engineering with stirring function
CN211922770U (en) * 2019-10-14 2020-11-13 楚宸建设集团有限公司 Hydraulic engineering desilting device
CN212001335U (en) * 2020-01-31 2020-11-24 安徽骏雄建筑工程有限公司 Mud removing device for hydraulic engineering
CN212026400U (en) * 2020-02-09 2020-11-27 徐州云创物业服务有限公司 River course cleaning device for hydraulic engineering

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114197382A (en) * 2021-12-28 2022-03-18 山东安澜工程建设有限公司 Waterproof drainage device based on hydraulic engineering

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Application publication date: 20210316

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